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Weed & Green Pre-emergent and Post-Emergent Weed Killer

$25

Weight: 32 oz. concentrate Coverage: Treats up to 1,250 sq. ft.

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Weed & Green Pre-emergent and Post-Emergent Weed KillerWeed & Green Pre-Emergent Weed ControlImage of a man spraying Weed & GreenBack of package for Weed & GreenWeed & Green Pre-emergent and Post-Emergent Weed Killer data sheetWeed & Green Pre-emergent and Post-Emergent Weed Killer data sheetWeed & Green Pre-emergent and Post-Emergent Weed Killer data sheet

Pre-emergent and post-emergent weed killer

Hose-on weed control for lawns that prevents and eliminates weeds while greening your grass blades with iron-nutrient formula.

$25

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Weed & Green Pre-emergent and Post-Emergent Weed KillerWeed & Green Pre-Emergent Weed ControlImage of a man spraying Weed & GreenBack of package for Weed & GreenWeed & Green Pre-emergent and Post-Emergent Weed Killer data sheetWeed & Green Pre-emergent and Post-Emergent Weed Killer data sheetWeed & Green Pre-emergent and Post-Emergent Weed Killer data sheet

Kill weeds, not your lawn

Weed & Green prevents and eliminates weeds while giving you a greener, thicker lawn.

Our dual-action pre-emergent and post-emergent weed control makes eliminating weeds as easy as watering your lawn. Its powerful iron (FeHEDTA) formula quickly greens up your lawn while preventing crabgrass and broadleaf weeds like dandelions from germinating in early spring. It continues to control weeds in your lawn from spring through fall, leaving it healthier and more vibrant than before.

Effective as a pre-emergent against crabgrass and as a pre- and post-emergent on broadleaf weeds like black medic, plantain, thistle, chickweed, creeping buttercup, creeping charlie, dandelion, geranium sp., English daisy, false dandelion, healall, oxalis, speedwell sp/, knotweed, shepherd’s-purse, silverweed cinquefoil, white clover, wild chamomile, as well as moss, liverworts, algae and lichens. It can also control or suppress lawn diseases: dollar spot, rust and/or snow mold.

At Sunday, we create lawn solutions without harsh chemicals—so you can return to enjoying your lawn faster.

Product Features:

  • Preemergent and postemergent
  • Lawn-safe iron formula
  • Prevents crabgrass and broadleaf weeds
  • Controls active weeds, moss, algae and lichen
  • Suppresses lawn disease like snow mold
  • Greens up lawn quickly
  • Easy hose-on application
  • Treats up to 1,250 sq. ft.

Ingredients:

Iron HEDTA (FeHEDTA): High concentration of chelated iron* prevents, controls and suppresses weeds, disease, moss, algae, lichens in lawns.

*Iron may cause temporary discoloration of dormant grass or staining - spray carefully

Instructions:

For best results, follow the product label and treat weeds early spring through fall.

  1. Shake well, attach sprayer to hose and turn on water
  2. Turn nozzle to spray and apply uniformly across lawn, avoid spraying on hard surfaces to prevent staining from iron
  3. Allow lawn to dry fully before returning to use. Wait 24 hours before seeding lawn or applying fertilizer

Application Guidelines:

Pre-emergent use: Apply every 3-6 weeks, up to 2 times per year

Post-emergent use: Apply every 3-4 weeks, up to 4 times per year

Helpful Tips from Yard Advisors:

How does Weed & Green work?

Grass and weeds absorb iron differently. Weeds quickly take in too much iron, which becomes toxic and kills them. Grass absorbs iron more slowly and can tolerate higher amounts. This difference allows us to target weeds effectively and safely while giving your lawn a healthy, deeper green color.

What weeds can I use Weed & Green on?

Weed & Green can be used as a pre-emergent for crabgrass and broadleaf weeds, and as post-emergent for broadleaf weeds, moss, algae, and lichen. It will help to suppress lawn diseases* including dollar spot, rust and snow mold.

*Not for use in California

While it’s effective as a pre-emergent on crabgrass, it won’t control existing crabgrass.

Will this preemergent cause discoloration to dormant lawns?

Weed and Green can be applied before or after weeds begin to emerge. This might mean you’re applying to a dormant lawn - or grass that’s not yet green and actively growing. If your lawn is dormant, Weed & Green may cause temporary discoloration of grass. But don't worry! Any grayish or brown color is temporary, and grass will return to its natural green as it grows.

What’s pre-emergent herbicide? What’s post-emergent herbicide?

A pre-emergent weed killer is designed to prevent weeds from sprouting above ground and works by targeting weeds as they germinate underground.

A post-emergent weed control controls weeds and other plants after they emerge from the soil.

Is there a difference between pre-emergent and post-emergent applications for Weed & Green?

Yes! Temperature and application frequency matter.

  • For pre-emergent control: Apply when soil temps reach 50-55 degrees F, and reapply 3-6 weeks later up to 2 times per year in the same area.
  • For post-emergent control: Apply anytime from spring through fall, and repeat treatment every 3-4 weeks up to 4 times per year in the same area.

Are there any US states where this is not approved for use?

Approved in all states, except CA (pending).

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Bottle of Weed & Green Hose-end Sprayer for Lawns on green lawn

Weed & Green Pre-emergent & Post-Emergent Instructions

Get step-by-step instructions for applying Weed & Green, your selective pre-emergent and post-emergent weed solution. Our lawn-safe iron formula stops weeds before they start and naturally greens up your grass.

Read article

Customer reviews

Based on 225 reviews!
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Jason
Verified Reviewer
Sadly didn't work for me

Unfortunately the spray doesn't appear to have worked for me.

Comments by Store Owner on Review by Store Owner on Sat May 31 2025
Store Owner
We're sorry to hear that your weed control results aren't as expected! Here are some Best Practices to follow for best results. 1.) Try to apply on a sunny day. While not mandatory, sunshine will improve the efficacy and speed of our herbicides. With sunshine unfiltered by clouds, our herbicides will work even better. A rainfall within 3 hours after application can make the herbicides ineffective. Optimal temperatures for application are between 50F to 85F. ​​​​2.) Apply when the weeds look healthy. When weeds are stressed or injured, weeds release hormones to recover. These hormones make herbicides less effective. Hormones are also released if weeds are mowed; we recommend not applying on the same day you mow. ​​​​3.) Apply the leaves liberally. Our herbicides just need to make contact with the leaves to work; trying to apply to the roots won't be effective. For best results, you want the leaves soaked, but not to the point where the herbicides is dripping off the leaves. ​​​​4.) Know the age of the weed. Older and established weeds will likely require more applications. For older weeds, we recommend doing multiple applications on the same day; just let the leaves dry out in-between applications.
Published date
05/30/25
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Josh
Verified Reviewer
Works Well But. . .

I've used the Pre-emergent and Post-Emergent Weed Killer 3 times now and it works great. I've seen lasting results as well. However, the hose attachment has only worked correctly 1 of those times. The concentrate was only coming out of the center instead of the whole spray. The product works great, ...

Published date
05/29/25
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ANDREW
Verified Reviewer
Fab weed killer!

Using this weed and Green pre and post emergent weed killer is a game changer for our spring lawn! The grass is super green and lush, weeds are gone, super happy!

Published date
05/29/25
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Jake
Verified Reviewer
Decent product

After one application it seems to effectively remove dandelions and clover. It does not seem to have much of an impact on crabgrass. Planning to apply a second time if the weather will ever cooperate with my schedule.

Published date
05/28/25
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Bruce
Verified Reviewer
Weed & Green Emergent Weed Killer

We had always hired a service to maintain and manage the weeds in our lawn. But being retired and wishing to cut down on expenses we tried the Sunday lawn plan. The non-chemical weed killer works pretty well. It's not perfect, but I am more than satisfied with the results.

Published date
05/28/25
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Chad
Verified Reviewer
Great product!

Worked as advertised, and easy to use with the hose attachment.

Published date
05/27/25
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DEBORAH
Verified Reviewer
Really works!!!!

I was amazed how this weed killer works. I sprayed my grass on Saturday and then this past Monday, I spread more grass seed and saw that the weeds leaves were brown. No damage to the grass. This product is true to its word kills the weeds not the grass.

Published date
05/27/25
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ANDREW
Verified Reviewer
Weed and Green Review

It has done a great job slowing the growth of the creeping Charlie in my yard. I have already bought another bottle to apply again in summer!

Published date
05/27/25
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Sarah
Verified Reviewer
Weed Killer

This product worked great! The morning after I sprayed my lawn our dandelions were all wilted.

Published date
05/27/25
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John
Verified Reviewer
Weed Killer Winner

Works as advertised, spray and watch the weeds die

Published date
05/27/25
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